Explain how to solve a system of three equations using the elimination method.

write all the equations in standard form cleared of decimals or fractions.

choose a variable to eliminate; then choose any two of the three equations and eliminate the chosen variable.

select a different set of two equations and eliminate the same variable as in step 2.

solve the two equations from steps 2 and 3 for the two variables they contain.

substitute the answers from step 4 into any equation involving the remaining variable.

check the solution with all three original equations.

Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )

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